Abstract
Global event shape variables and charged particle spectra are studied from hadronic collected by the L3 detector corresponding to hadronic center of mass energies between 30 and 189 GeV. Strong coupling constant ( α s) and active number of flavours (N f) are determined from the event shapes to be: α s(M z) = 0.1220 ± 0.0015(exp) ± 0.0060(theo), and N f = 4.4 ± 1.0(exp) ± 2.0(theo) respectively. The energy evolution of the moments of the event shapes have been fitted to a combination of O( α s 2) calculations and power law parametrization of the non-perturbative part, and the universality of the power law behaviour is observed.
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